A Brooklyn deli owner was convicted today of hitting a teen in the head with a hammer during a scuffle inside his store.

Salah Ahmed, 37, sat stoiclly as the jury announced the guilty verdict for first-degree assault, which brings a minimum of five years behind bars. His family and friends in the courtroom sighed in disappointment when the decision was read.

Ahmed’s lawyers had claimed he struck Bunkless Bovian, then 14, because Bovian and two pals were punching one of his clerks, Zack Kassim, on April 13, 2008, at the Brownsville bodega.

But the jury didn’t buy that explanation and after deliberating for about five hours over yesterday and today found the Yemeni-immigrant guilty of the most serious charge.